Chemical Engineering - Chemical Engineering Basics

36. 

Pick out the wrong statement.

A. Cold cracking of a weld is due to the presence of hydrogen gas in the weld.
B. True stress is given by, σ = σE (1 + εE), where σE and εE are engineering stress and engineering strain respectively.
C. Phosphorous can be easily recovered in the iron blast furnace.
D. High residual stress at the surface is beneficial for fatigue properties of a material.

Answer: Option C

Explanation:

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37. 

Shampoos are commercially not available in the form of

A. powder
B. gaseous mixture
C. solution
D. emulsion

Answer: Option B

Explanation:

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38. 

A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its

A. aqueous tension.
B. saturated humidity.
C. vapor pressure.
D. absolute humidity.

Answer: Option A

Explanation:

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39. 

Carbon is present in the form of __________ in grey cast iron.

A. spheroids
B. nodular aggregates of graphite
C. flakes
D. cementite

Answer: Option C

Explanation:

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40. 

In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :

A. Jet of water at high pressure.
B. Blast of air.
C. Mixture of water and air.
D. Rain of molten lead.

Answer: Option D

Explanation:

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